havi, the all-father has indestructible as long as there are four or more historic cards in your graveyard. (artifacts, legendaries, and sagas are historic.)
sage project — whenever havi or another legendary creature you control dies, return target legendary creature card with lesser mana value from your graveyard to the battlefield tapped.
sage project — whenever havi or another legendary creature you control dies, return target legendary creature card with lesser mana value from your graveyard to the battlefield tapped.